CAUTION: When adding multiple nodes to the cluster using the allocation
algorithm, ensure that nodes are added one at a time. If nodes are added
concurrently, the algorithm assigns the same tokens to different nodes.

Note: For
RF_number if the keyspaces in the datacenter have
different replication factors (RF), use the factor of the most data
intensive keyspace, or when multiple keyspaces with equal data intensity
exist, use the highest RF. When adding multiple nodes alternate between
the different RF.

Change any other non-default settings you have made to your existing cluster in
the cassandra.yaml file and
cassandra-topology.properties or
cassandra-rackdc.properties files. Use the
diff command to find and merge any differences between
existing and new nodes.

Verify that the node is fully bootstrapped using nodetool status. All other nodes must be up (UN) and not in any
other state.

After all new nodes are running, run nodetool
cleanup on each of the previously existing nodes to remove the keys
that no longer belong to those nodes. Wait for cleanup to complete on one node
before running nodetool cleanup on the next node.